Receptacle or tank.



R. P. STEWART. BECEPTACLE 0R TANK.

A lication filed Oct. 14. 1901.)

(No Model.)

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ROBERT P. STEW'ART, OF PARIS, TEXAS, ASSIGNOR OF ONE-HALF 'lO WVILLIAME. IIOGUE, OF PARIS, TEXAS.

RECEPTACLE OR TANK.

SPECIFICATION forming part of Letters Patent No. 697,954, dated April15, 1902.

Application filed October 14, 1901. $erial No. 78,578. (No model.)

To [all whom, it may concern.-

Be it known that I, ROBERT P. STEWART, a citizen of the UnitedStates,residing at Paris, in the county of Lamar and State of Texas,have invented a new and useful Receptacle or Tank, of which thefollowing is a specification.

My present invention relates to a novel method of producing asubterranean or buried receptacle or tank and to the product of themethod.

In many localities, particularly in warmer climes,it is customary toprovide underground tanks or receptacles for the storage of water andfor other purposes, notably the storage of grain or fodder, in whichcase the receptacle is termed a silo.

The object of my invention is to originate a novel method by thepractice of which an underground tank of great durability andinexpensive construction may be produced.

A further object of the invention is to permit of the utilization ofmetal for the construction of the tank, the metallic receptacle beingstrengthened to resist the pressure upon its walls and protected fromthe corrosive action of the earth by a protective coating capable ofbeing easily and inexpensively applied to a tank, either before or afterthe latter is placed in position in the ground.

To the accomplishment of these objects the method comprehends theseveral steps to be enumerated, and the product of the process embodiesthe structure illustrated in the accompanying drawings, and more fullyhereinafter described.

In said drawings, Figure l is an elevation of my underground tankcomplete, the ground being shown in section. Fig. 2 is an elevation ofthe tank, showing the several layers of the coating broken away toillustrate the manner in which said coating is built up; and Fig. 3 is acentral longitudinal section through the tank complete.

In practicing the method I first produce or procure a metallic tank orreceptacle 1 of the proper dimensions,depending,of course,upon thepurpose for which the same is intended. The tank preferably comprises acylindrical body 2, having a trunco-conical or substan tiallydome-shaped top 3, open at its center and surmounted by a cylindricalupstanding neck-flange 4, coinciding with the opening through the top ofthe tank. The neck-flange 4 usually extends some distance above theground, and the top 3, which is usually located below the surface of theground and is covered with earth, is made of conical form in order tobetter resist the weight of the earth and to throw the strain of thesuperimposed weight upon the vertically-disposed side walls of the tank.A metallic tank of this character located underground will keep water orother contents cool and fresh for a long period; but it is obvious thatthe deleterious action of the ground upon the metal in contact therewithwould quickly corrode and destroy the tank if unprotected. I thereforeproceed to cover the entire exterior of the metallic tank or receptacle1 with a coating of hot asphaltum, which material having withstood theaction of the elements for ages is Well calculated to protect the tankfrom the action of such elements as would effect the disintegration ofthe metal. This asphaltum layer (indicated by the numeral 5) ispermitted to cool until it has become set to a certain extent and issufficiently sticky or adhesive to adhere strongly to a layer oftarred-felt paper 6, with which theasphaltum layer is now covered. Thispaper layer, which may be either single or double or any greater extent,may or may not require a binder for the purpose of holding it in placeduring the application of a succeeding layer of asphaltum. If the edgesof the paper lap to a considerable extent or if the paper is carriedaround the tank more than a single turn, a binder, while not absolutelynecessary, is desirable, and for this purpose I wind the applied paperlayer with a flexible strand 7-as, for instance, a cord. I next proceedwith the application of a second asphaltum layer 8 and continue theapplication of asphaltum and tarred -felt paper alternately, accordingto the desired thickness of the protective coating. If, however, it isonly desired to employ the two layers of asphaltum with the singleintermediate layer of tarredfelt paper, the asphaltum layer 8 ispreferably covered with a fabric covering 9, which serves to prevent thesettling of the layer 8 during the cooling thereof and also serves tohold the final asphaltum layer 10, which is now spread over the fabricin the manner shown. The application of thisfinal layer of asphaltumcompletes the method,and it should be noted that as the several layersof the protective coating are extended over the conical or domeshapedtop 3 and around the neckfiange 4 any tendency of said coating to sagwill be effectually resisted.

The method as described is that preferably employed in the protection ofthe buried or underground receptacle; but certain of the stepsenumerated may be omitted in some instances. For instance, thebinding-strand 7 and the fabric 8 may or may not be employed, inaccordance with the desires of the manufacturer and the character of thereceptacle to be produced. The invention in its broad aspect comprehendsthe formation of a protective covering made up of alternate layers ofasphaltum and tarred-felt paper, any number of such layers beingemployed, the first and last layers of the covering being composed ofthe asphaltum applied while hot and thereafter permitted to cool andharden.

From the foregoing it will be observed that I have produced a novelunderground or buried receptacle comprising a metallic tank protected bya covering of novel form and applied in accordance with a novel method,said covering serving to render the tank absolutely air-tight and toresist the corrosion and consequent disintegration of the tank. I wish,however, to be distinctly understood as reserving to myself the right tovary the dimensions and contour of the receptacle, the number of layersof which the protective covering is composed, and to employ or omit thebinding-strand and fabric, or either of them, provided only that suchvariations are properly embraced within the scope of the protectionprayed.

What I claim is- 1. That method of producing an underground receptaclewhich consists in first applyinga layer of hot asphaltum to the surfaceof a tank and permitting said layer to stand until it becomes partiallyset and adhesive, next applying'a layer of tarredfelt paper to theasphaltum layer under sufficient pressure to effect an adhesive uniontherewith, and finally applying to the surface of the tarredfelt paper asecond layer of hot asphaltum and permitting the same to set.

2. That method of producing an underground receptacle which consistsfirst in ap plying a layer of hot asphaltum to the surface of a tank,and permitting said layer to partially set, next applying alayer oftarred-felt paper to the layer of asphaltum, next wrapping thetarred-felt paper with a binding strand, and finally applying a secondlayer of asphaltum to the surface'of the paper.

3. That method of producing an underground receptacle which consistsfirst in applying a layer of hot asphaltum to a tank, and permittingsaid layer to become partially set, next applying a layer of tarred-feltpaper to the asphaltum layer, next binding the tarred-felt paper with aflexible bindingstrand, next applying a second layer of asphaltum to thesurface of the bound paper, next applying a layer of fabric upon theasphaltum layer while the latter is in an adhesive condition,and nextapplying to the fabric a final layer of asphaltum.

4. That method of producing an underground receptacle which consists inapplying alternate layers of asphaltum and tarred-felt paper to a tank,binding the tarred-felt paper layer or layers with a flexible bindingstrand or strands, applying a layer of fabric to the last layer ofasphaltum, and finally applying an asphaltum layer to the outer surfaceof the fabric.

5. An underground receptacle of the character specified, comprising atank equipped with a protective covering of asphaltum and tarred-feltpaper, said paper being bound with a flexible binding-strand.

6. An undergound receptacle of the char acter specified, comprising atank equipped with a protective covering composed of alternate layers ofasphaltum and tarred-felt paper, a flexible binding-strand wound uponthe layer or layers of tarred-felt paper, a fabric layer imposed uponthe outer layer of asphaltum, and a finallayer of asphaltum, coveringthe fabric.

7. That method of producing an underground receptacle which consistsinapplying alternate layers of asphaltum and tarred-felt paper to a tank,next applyinga layer of fabric to the last layer of asphaltum, andfinally applying an asphaltum layer to the outer surface of the fabric.

8. An underground receptacle of the character specified, comprising atank equipped with a protective coating composed of alternate layers ofasphaltum and tarred felt paper, a fabric layer imposed upon the outerlayer of asphaltum, and a final layer of asphaltum covering the fabric.

In testimony that I claim the foregoing as myown I have hereto affixedmy signature in the presence of two witnesses.

ROBERT P. STEWVART.

\Vitnesses:

BOB. CAMPBELL, M. J. IIATHAWAY.

